Taken a type of welding production line of excavator boom in the planning and design stage as an example, the application of discrete event simulation platform Plant Simulation in the scheme design of material distribution for welding production line of excavator boom is studied. The Rail Guided Vehicle (RGV) is used as the conveying unit in the welding production line of excavator boom. The scheduling control strategy of production line is analyzed, three RGV material distribution schemes are designed according to random operation, shortest driving distance and shortest waiting time, and the schemes are modeled and simulated. With the output maximization and work station load balancing as the goals, the optimal material distribution schemes under different optimization goals are analyzed, and the optimized annual output increases 475 and each work station keeps the load balancing, which can provide theoretical basis and scientific guidance for the enterprise in the selection and construction of material distribution scheme for intelligent production line.